| ||||
|---|---|---|---|---|
| Cardinal | thirty-one | |||
| Ordinal | 31st (thirty-first) | |||
| Factorization | prime | |||
| Prime | 11th | |||
| Divisors | 1, 31 | |||
| Greek numeral | ΛΑ´ | |||
| Roman numeral | XXXI | |||
| Binary | 111112 | |||
| Ternary | 10113 | |||
| Senary | 516 | |||
| Octal | 378 | |||
| Duodecimal | 2712 | |||
| Hexadecimal | 1F16 | |||
31 (thirty-one) is the natural number following 30 and preceding 32. It is a prime number.